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United States Patent |
5,065,898
|
Michalewski
,   et al.
|
November 19, 1991
|
Apparatus for orienting and injecting fasteners
Abstract
Apparatus for initially orienting and then injecting fasteners (F) into
fastener grasping fingers (46), the fasteners being received by the
apparatus (10) from a non-dedicated feed tube (18). The apparatus
includes, as its principle components, a mounting frame (20), an
adjustable orientator (12) mounted on the frame, an adjustable injector
(14) also mounted on the frame, and a dedicated feed tube assembly (16)
extending between the adjustable orientator and the adjustable injector.
The orientator includes right and left slides (50, 52, and 56,
respectively) the spacing between them being adjustable, and further
includes an orientation detector (136, 138) for determining whether or not
proper orientation has been achieved. The adjustable injector includes an
injector body (192), an injector slide assembly (214) slidably mounted
within the body, an injector knife (226) moveable relative to the slide,
and a cylinder assembly (268) for moving both the injector and the
injector slide from a retracted position to an intermediate extended
position, and for further moving the injector to a full injection
position.
Inventors:
|
Michalewski; David (Buffalo, NY);
Roberts; Bradley M. (Williamsville, NY)
|
Assignee:
|
Gemcor Engineering Corporation (Buffalo, NY)
|
Appl. No.:
|
594339 |
Filed:
|
October 9, 1990 |
Current U.S. Class: |
221/171; 29/710; 221/172; 221/239; 221/241 |
Intern'l Class: |
B65H 001/00 |
Field of Search: |
221/156-157,171-173,208,224,236,238-239,241,245,258
29/771,786,787,809,709-710
|
References Cited
U.S. Patent Documents
3517856 | Jun., 1970 | Ginther | 221/236.
|
4466555 | Aug., 1984 | Yarnitsky et al. | 221/238.
|
4700471 | Oct., 1987 | Shemeta et al. | 221/171.
|
4801043 | Jan., 1989 | Cindric | 221/173.
|
Primary Examiner: Bollinger; David H.
Attorney, Agent or Firm: Hodgson, Russ, Andrews, Woods & Goodyear
Claims
What is claimed is:
1. Apparatus for orientating and injecting fasteners (F) into fastener
grasping fingers (46), the fasteners being received from a non-dedicated
feed tube (18) through which a variety of fasteners may be propelled from
a fastener selection apparatus, the fasteners having heads (h) and tails
(t) of differing diameters; said apparatus comprising in combination:
a mounting frame (20);
adjustable orientation means (12) mounted on the frame for orienting and
discharging fasteners, the orientation means having retaining means (98)
for retaining an end of the non-dedicated feed tube (18), spaced apart
jaws (50, 52, and 56) the spacing of which may be adjusted for orientating
fasteners having differing diameter tails received from the non-dedicated
feed tube, the orientation means further having a discharge opening (114a)
through which the oriented fasteners may be discharged;
a dedicated feed tube assembly (16) having receiving and discharge ends
(116, 188) the receiving end being interconnected with the discharge
opening of the orientation means; and
adjustable injection means (14) mounted on the frame for injecting
fasteners, the injection means having retaining means (212) for retaining
the discharge end of the dedicated feed tube, a pair of spaced apart jaws
(228, 230) the distance between the jaws being adjustable for receiving
fasteners having tails of differing diameters, and a injector knife (226)
for pushing the fastener into fastener grasping fingers (46).
2. The apparatus as set forth in claim 1 wherein the adjustable injection
means (14) further includes an injector slide (214), the spaced apart jaws
being supported by the injector slide, and the injector slide being
movable between a first fastener receiving position and a second fastener
injecting position
3. The apparatus as set forth in claim 2 wherein the adjustable injection
means (14) further includes adjustable stop means (302) for limiting the
movement of the injector slide.
4. The apparatus as set forth in claim 1 wherein the adjustable orientation
means (12) includes a detector (136, 138) for determining whether or not a
fastener received by the adjustable orientation means has become oriented.
5. The apparatus as set forth in claim 1 wherein the adjustable injection
means is mounted on the frame by means of a mounting bracket (26), the
mounting bracket being secured to the frame for front-to-back adjustment,
and the adjustable injection means being secured to the mounting bracket
for adjustable side-to-side movement.
6. An adjustable orienting apparatus (12) for orienting fasteners, the
fasteners (F) being received from a non-dedicated feed tube (18) through
which a variety of fasteners may be propelled from a fastener selection
apparatus, the fasteners having heads (h) and tails (t) of differing
diameters; said orienting apparatus comprising:
a body (50) having a discharge opening (114a);
a pair of spaced apart opposed jaws carried by the body, each of the jaws
including a shoulder portion (52s, 56s) upon which the head (h) of a
fastener (F) may rest and a flank portion (50f, 56f), the jaws (50, 52,
and 56) being adjustable towards and away from each other so that the
distance between the flank portions of the jaws may be adjusted to a
distance just slightly in excess of the tail diameter of the fastener to
be oriented, the tail (t) of a fastener when aligned extending between the
flank portions, the pair of jaws terminating adjacent the discharge
opening;
a cover (90) mounted on the body above the pair of spaced apart jaws, the
cover having an internal cavity (90r);
retaining means (98) on the cover for retaining the discharge end of a
non-dedicated feed tube (18), fasteners being discharged in a non-oriented
manner from the non-dedicated feed tube into the cavity (90r) of the
cover, the cavity permitting tumbling of a fastener until it falls upon
the jaws (50, 52, and 56), the head (h) of the fastener (F) being
supported by the shoulder portion of the jaws and the tail (t) of the
fastener passing between the flanks of the jaws to cause the fastener to
be oriented;
further retaining means (118, 120, 122) adjacent the discharge opening in
the body for retaining the inlet end (116) of a dedicated feed tube
assembly (16); and
means (142) for facilitating the movement of an oriented fastener to that
end of the spaced apart jaws located adjacent the discharge opening in the
body.
7. An adjustable orienting apparatus (12) of orienting fasteners, the
fasteners (F) being received from a non-dedicated feed tube (18) through
which a variety of fasteners may be propelled from a fastener selection
apparatus, the fasteners having heads (h) and tails (t) of differing
diameters; said orienting apparatus comprising:
a body (50) having a discharge opening (114a);
a pair of spaced apart opposed jaws carried by the body, each of the jaws
including a shoulder portion (52s, 56s) upon which the head (h) of a
fastener (F) may rest and a flank portion (50f, 56f), the jaws (50, 52,
and 56) being adjustable towards and away from each other so that the
distance between the flank portions of the jaws may be adjusted to a
distance just slightly in excess of the tail diameter of the fastener to
be oriented, the tail (t) of a fastener when aligned extending between the
flank portions, the pair of jaws terminating adjacent the discharge
opening;
retaining means (98) interconnected with the body (50) for retaining the
discharge end of a non-dedicated feed tube (18);
further retaining means (118, 120, 122) adjacent the discharge opening in
the body for retaining the inlet end (116) of a dedicated feed tube
assembly (16);
means (142) for facilitating the movement of an oriented fastener to that
end of the spaced apart jaws located adjacent the discharge opening in the
body; and
detecting means (132) for detecting whether or not a fastener has passed
through the discharge end of the non-dedicated feed tube and further
detecting means (136, 138) for detecting whether or not a fastener has
become oriented between the spaced apart jaws.
8. The apparatus for orienting fasteners as set forth in claim 7 further
comprising stop means (176) disposed adjacent the spaced apart opposed
jaws for stopping the movement of fasteners along the jaws, and control
means (134) operable to release the stop means when a fastener has been
detected.
9. The apparatus for orienting fasteners as set forth in claim 7 further
including blow-back means (170, 172) and control means (134) for
initiating the operation of the blow-back means when the introduction of a
fastener into the apparatus has been detected but when an oriented
fastener has not been detected after a suitable time interval.
10. An adjustable injection apparatus (14) for injecting fasteners (F) into
fastener grasping fingers (46), the injection apparatus comprising:
an injector body (192) having a box-like cavity therein, the cavity being
open at one end, there being a wall portion (200) opposite the open end;
an injector slide (214) mounted within the box-like cavity for sliding
movement between a fastener receiving and loading position and a fastener
injecting position wherein a portion of the injector slide extends beyond
the injector body;
a pair of spaced apart opposed jaws (228, 230) carried by the injector
slide, the jaws being capable of receiving a fastener (F) when the
injector slide is in its loading position and for carrying the fastener
towards the fastener grasping fingers (46) as the injector slide is moved
to its injecting position;
an injector knife (226) carried by the injector slide (214) for movement
relative thereto from a retracted position to an extended position, the
injector knife when in its retracted position being contacted by a portion
of the injector slide as the injector slide is moved from its loading
position to its injecting position, and the injector knife subsequently
being moved from its retracted position to its extended position to cause
a fastener (F) to be shifted from the opposed jaws to fastener grasping
fingers (46);
fluid cylinder means (268) for moving the injector and injector slide, the
fluid cylinder means including a cylinder (270) mounted on the end wall
(200) of the injector body, and a piston rod (274) which extends through
an aperture (200a) in the end wall and which is connected to one end of
the injector knife 226;
stop means (302) extending between the injector body and the injector slide
for limiting the movement of the injector slide as it moves from its
loading position to its injecting position; and
compression spring means (284) disposed about the piston rod and extending
between the end wall (200) and the injector slide (214), the parts being
so arranged that when the piston rod is moved from a retracted position to
a partially extended position the spring will cause corresponding movement
of the injector slide until the stop is engaged by the slide, and further
movement of the piston rod away from its partially extended position to
its fully extended position causing the injector knife to be moved from
its retracted position to its extended position as its injector slide is
held from further movement by the stop means.
11. The injector apparatus as set forth in claim 10 wherein the stop means
(302) is adjustable to establish differing injectioning positions for the
injector slide.
12. The injector apparatus as set forth in claim 10 wherein the opposed
jaws (228, 230) are adjustable towards and away from each other to accept
fasteners having differing tail diameters.
13. The injector apparatus as set forth in claim 10 wherein the stroke of
the piston rod may be adjusted.
Description
TECHNICAL FIELD
The present invention relates generally to apparatus for installing
fasteners, and more particularly to an apparatus for orienting and
injecting fasteners having heads and tails of differing diameters, the
fasteners being received from a fastener selection apparatus through
non-dedicated feed tubes and being injected into fastener grasping fingers
for subsequent installation and securement to two or more workpieces.
BACKGROUND OF THE INVENTION
Prior art machines for installing and securing fasteners are well known in
the art and the present invention relates to such machines which are
capable of installing either slug or headed rivets or two-piece pin and
collar fasteners such as that type manufactured by the Huck Manufacturing
Company of Fort Worth, Texas. Slug rivets are illustrated in U.S. Pat. No.
4,819,856 whereas headed rivets are illustrated in U.S. Pat. No.
4,609,134. The two-piece pin and collar fasteners are illustrated in SME
paper AD84-842 and also in European patent application 03455935. These
fasteners may be installed by a variety of machines and one such machine
is illustrated in U.S. Pat. No. 3,534,896. In this particular form of
machine a transfer mechanism is provided which performs sequential
drilling, rivet upsetting, and shaving operations, the fasteners being
inserted after the transfer mechanism has been shifted from its drilling
position to its upsetting position.
The fastener installing machine may be provided with differing forms of
mechanisms for causing the fastener to be inserted into fastener grasping
fingers carried by the machine. For example, if slug rivets are being
installed slug rivets will be fed from a storage hopper to a blow tube
which will in turn blow the slug rivets into an injecting mechanism or
directly into rivet grasping fingers of the type shown in 4,819,856 where
they are axially aligned with the centerline of the aperture drilled into
the workpieces prior to insertion. If a headed rivet, or a Huck fastener
is to be inserted, it will be initially oriented by a mechanism associated
with a feed hopper and then blown through a feed tube to an orienting and
insertion device. Once such device is shown in 4,609,134 wherein the
fastener is caused initially to be oriented by supporting the head of the
fastener on shoulders of spaced apart rails, the tail of the fastener
extending between the rails, the headed fastener then being shifted
laterally by an insertion bar until it is placed between fastener grasping
fingers. Various other forms of fastener orienting and insertion devices
are known in the art but in all of these it is necessary that the fastener
to be oriented be initially transferred through a dedicated feed tube to
the orienting and insertion apparatus, which apparatus is specific for a
certain tail width of the fastener. In addition, a specific or dedicated
feed tube is required which is specific to the head width of the fastener
in order to maintain alignment of the fastener as it is transported from
the aligner disposed adjacent the feed hopper to the orienting and
insertion device.
The foregoing constructions generally perform in a satisfactory manner but
require changes to the rivet orienting and insertion apparatus in that
every time a new fastener is selected for insertion into workpieces it is
necessary to select a new orienting and insertion apparatus if the tail
diameter is different. Similarly, a new feed tube is required if the head
diameter is different.
In addition, it is sometimes difficult to transport the fastener from the
insertion apparatus into the fastener receiving fingers, particularly when
using certain forms of transfer mechanisms on the riveting machine as the
transfer mechanism may require excessive clearance between its centerline
and the end of the insertion apparatus which is closest to the centerline
of the machine.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide an apparatus for
orienting and injecting fasteners which is capable of receiving a variety
of fasteners having differing head and tail diameters, and which may also
be utilized with rivet insertion apparatus of the type requiring a large
clearance between the centerline of the transfer mechanism and the rivet
insertion apparatus.
More particularly, it is an object of the present invention to provide an
apparatus capable of orienting fasteners having heads and tails of
differing diameters which are received from a non-dedicated feed tube
extending away from a fastener selection apparatus, the orienting
apparatus discharging the oriented fasteners through a dedicated feed tube
to an injector having a pair of spaced apart jaws, the distance between
the jaws being adjustable for receiving fasteners having tails of
differing diameters whereby fasteners of differing diameters may be
received and injected into rivet grasping fingers.
It is an additional object of the present invention to provide an
adjustable orientation apparatus for orienting fasteners which may have
heads and tails of differing diameters and which are received from a
fastener selection apparatus through a non-dedicated feed tube, the
orientation apparatus having jaws which adjust towards and away from each
other, the orienting apparatus also being capable of determining whether
or not a fastener received through the non-dedicated feed tube has become
properly oriented, and if not, of initiating a fastener tumbling action to
facilitate the orientation of the received fastener.
It is a further object of the present invention to provide a fastener
injection apparatus for injecting fasteners into fastener grasping
fingers, the injection apparatus including an injector body and an
injector slide mounted within the body for sliding movement between
retracted and extended positions, the injector slide including spaced
apart adjustable jaws which may receive fasteners having differing tail
diameters, the jaws being moveable with the injector slide, and an
injector knife supported by the slide and moveable between a retracted
position and an extended position wherein a fastener may be ejected from
the slide to fastener grasping fingers.
The above objects and other objects and advantages of this invention will
become more apparent after a consideration of the following detailed
description taken in conjunction with the accompanying drawings in which a
preferred form of this invention is illustrated.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a right-side view of the orientating and injecting apparatus of
this invention.
FIG. 2a is a front view of the orientating apparatus of this invention,
this view being taken generally along the line 2a--2a in FIG. 1.
FIG. 2b is a front view of the injecting apparatus of this invention, this
view being taken generally along the line 2b--2b in FIG. 1.
FIG. 3 is a right-side view of the orientating apparatus shown in FIG. 1 in
an enlarged scale, the apparatus being rotated in a clockwise direction
somewhat from that position it would normally occupy during use, its
normal in use position being shown in FIG. 1.
FIG. 4 is a top view of the apparatus shown in FIG. 3.
FIG. 5 is a top-sectional view of the apparatus shown in FIG. 3, this view
being taken generally along the line 5--5 in FIG. 3.
FIG. 6 is a rear view of the injecting apparatus shown in FIG. 3.
FIG. 7 is a rear-sectional view of the injecting apparatus shown in FIG. 3,
this view being taken generally along the line 7--7 in FIG. 4.
FIG. 8 is a left-side view of the injecting apparatus shown in FIG. 1.
FIG. 9 is a top view of the injecting apparatus shown in FIG. 8.
FIG. 10 is a front-end view of the injecting apparatus shown in FIG. 9.
FIG. 11 is a right-side sectional view of a portion of the injecting
apparatus shown in FIG. 1, this view being taken generally along the line
11--11 of FIG. 10.
FIG. 12 is a front-sectional view of the injecting apparatus shown in FIG.
11, this view being taken generally along the line 12--12 in FIG. 11.
FIG. 13 is a top-sectional view taken generally along the line 13--13 in
FIG. 11.
FIG. 13a is a top view taken generally along the line 13a--13a in FIG. 1.
DETAILED DESCRIPTION
In General
Referring first to FIG. 1, the apparatus for orientating and injecting
fasteners F is indicated generally at 10 and includes, as its principal
components, an adjustable orientator, indicated generally at 12, and an
adjustable injector, indicated generally at 14. The adjustable orientator
is interconnected with the adjustable injector by a dedicated feed tube
assembly indicated generally at 16. In this description a feed tube
assembly is considered to be "dedicated" when it is designed for receiving
a specific size of fastener, and particularly, a fastener having a
specific head h diameter. While a dedicated feed tube assembly extends
between the orientator and the injector, the orientator will in turn
receive fasteners through a non-dedicated feed tube 18, that is to say a
feed tube which is suitable for use with fasteners having differing head
diameters. Only the discharge end of the non-dedicated feed tube assembly
is shown in the drawings. In practice the inlet end of the feed tube 18
will be connected to a plurality of branch feed tubes each of which is
associated with its own fastener hopper. It is possible to select
fasteners from any one of a variety of fastener hoppers in a manner not
material to the present invention, and to feed the fastener selected
through the non-dedicated feed tube to the adjustable orientator 12.
The adjustable orientator is mounted on a bracket 20. The bracket is part
of a riveting machine frame, such as the type shown in U.S. Pat. No.
3,534,896, the bracket being disposed adjacent the shuttle or transfer
mechanism which carries the drilling device, the rivet insertion device,
and the other items which may be carried by the transfer head. As details
of the riveting machine of the type referred to above are well known to
those skilled in the art, they will not be described further herein.
The adjustable orientator is secured to the bracket 20 by means of a
mounting block 22 which is held to the bracket by suitable screws, not
shown. A mounting assembly, indicated generally at 24, is suitably secured
to an inclined surface 22a of the mounting block 22. The adjustable
orientator 12 is in turn secured to the mounting assembly 24 in a manner
not material to the present invention. As can be seen from FIG. 1, the
orientator will in operation be disposed at an angle so that that end
which discharges oriented fasteners, shown to the left in FIG. 1, is
disposed below that end which receives the fasteners to be oriented.
The adjustable injector is in turn mounted at the lower end of bracket 20
by an injector mounting bracket assembly indicated generally at 26. The
mounting bracket assembly includes a vertical plate 28, a horizontal plate
30, and a gusset 32, the parts being welded together. The vertical plate
28 extends above gusset 32 and is provided with a pair of spaced apart
apertures which receive suitable cap screw 34, the ends of which are
received in suitable threaded apertures in bracket 20 to hold the injector
mounting assembly securely thereto. In order to provide for suitable fore
and aft spacing of the injector, a shim of a suitably selected width is
disposed between the upper end of the vertical plate 28 and the lower end
of the bracket 20, an exemplary shim being shown at 36. A mounting
assembly 38, identical to the mounting assembly 24, is secured to the
lower end of the horizontal plate 30. The mounting assembly 38 consists of
two L-shaped gibs 40, the upper ends of which are secured to the
horizontal plate 30, and a T-shaped slide 42 received between the L-shaped
slides 40, the lower end of the T-shaped slide being secured to an upper
surface of the adjustable injector 14 in a conventional manner. It can be
seen that the adjustable injector can be moved from side to side by virtue
of the slide assembly, and it is possible to secure the parts together in
their desired position by means of a locking device 44. The purpose of the
shims 36 and cross-slide assembly 38 is to ensure that the adjustable
injector can be properly located horizontally with respect to the fastener
grasping fingers somewhat schematically shown at 46 in FIG. 1. The fingers
46 are carried by the transfer mechanism or shuttle of the fastener
applying machine and may be of differing configurations, although
generally they are of the type shown in U.S. Pat. No. 4,515,302 at 302.
Adjustable Orientator
As the fasteners are being delivered to the orientator by a non-dedicated
feed tube it is possible that they might tumble within the feed tube 18.
Thus, the feed tube 18 must have an internal diameter large enough to
accept the largest diameter fastener heads, and as small fasteners may be
conveyed through the feed tube, it is possible that very small fasteners,
and particularly those having short tails t, may tumble within the feed
tube. The adjustable orientator includes, as its major components, a rivet
slide including a rivet slide body 50 to which is secured an upper slide
body 52 by threaded fasteners 54 (FIG. 5), the rivet slide also including
a sliding jaw 56 as viewed in FIG. 5. Thus, the upper slide body 52 forms
one jaw of a pair of spaced apart jaws, the other jaw being the sliding
jaw 56. The sliding jaw 56 is supported upon a key 58 for side-to-side
movement, the jaw normally being biased to the left as viewed in FIG. 7.
To this end, a pair of socket head shoulder screws 60 are received in
suitable apertures 50a in the rivet slide body 50, the ends of the screws
being screwed into threaded apertures in the sliding jaws 56. Compression
springs 62 (FIG. 7) are disposed between the head of the shoulder screw
and an annular surface in the aperture 50a to bias the shoulder screws and
correspondingly the sliding jaw to the left as viewed in FIG. 7.
The sliding jaw 56 can be moved by operation of an adjusting mechanism
indicated generally at 64. The adjusting mechanism consists of an
adjusting screw 66 (FIG. 5), having a threaded end 66a received within a
threaded aperture of the sliding jaw 56, an intermediate enlarged-diameter
portion 66b rotatable with the threaded portion but held from relative
movement by a lock screw 68 which engages a groove 66c in the
enlarged-diameter portion 66b. A knob 70 is secured about an externally
extending cylindrical end portion 66d by roll pins 72 or the like, the
knob 70 being provided with a spur gear 74. Mounted on the knob 70 is a
rotating handle 76 which is secured to an index pin 78 by roll pin 80. The
end of the index pin 78 remote from the handle 76 will normally be biased
through a suitable aperture 82a (FIG. 3) in an index gear 82, the index
gear being provided with suitable indicia 84 which can be matched up with
corresponding indicia 86 on the surface of the body 50. A compression
spring 88 (FIG. 5) extends between an inner surface of the knob 70 and a
shoulder on the end of the index pin 78 which passes through the aperture
82a to normally bias the index pin into the aperture. However, by pulling
on the handle 76, the handle 76 and knob 70 can be rotated about the
centerline of screw 66, causing the gear 74 to rotate gear 82 until a
suitable indicia mark 84 can be placed into alignment with a corresponding
indicia mark 86 on the body 50. As the gearing is being rotated the
threaded portion 66a will cause inward or outward movement of the sliding
jaw 56. The engagement of the index pin 78 with the aperture 82a will hold
the parts in their desired operating position. When the parts have been
suitably adjusted the flank 56f (FIG. 7) of the sliding jaw 56 will be
held the desired distance away from the corresponding flanks 50f and 52f
of the rivet slide body 50 and and the upper slide body 52, respectively.
In addition, the shoulder portions 56s and 52s will also be suitably
spaced apart. It should be noted that the spacing between the flanks 56f
on the one hand and 52f and 50f on the other hand is specific to the
diameter of the tail of a rivet which is indicated by its "dash number".
It is this spacing which must be suitably adjusted as the head, regardless
of its diameter, will sit upon the shoulder which is initially V-shaped as
can best be seen in the section shown in FIG. 7.
Secured to the top of the body 50 and upper slide body 52 is a cover 90
which is provided with a suitable internal cavity or recess 90r as well as
laterally outwardly extending mounting feet 90f, the shank portion of
suitable mounting hardware 92 passing therethrough, the hardware 92
securing the cover 90 to the body 50, 52. A rear cover 94 is mounted upon
the cover 90 by suitable screws 96 (FIG. 6), the rear cover closing the
recess 90r to the rear. Mounted upon the rear surface of cover 94 is
retainer assembly, indicated generally at 98 in FIG. 1, which assembly is
for the purpose of retaining the discharge end of the non-dedicated feed
tube 18. To this end, the retainer assembly includes a retainer plate 100
(FIGS. 3 and 6) which is pivotally secured on the rear cover 94 by a
shoulder screw 102, the retainer plate further carrying a thumbscrew 104
which may be released for the purposes of swinging the retainer plate 100
from its retaining position illustrated in FIG. 6 to an open position
where the discharge end of the non-dedicated feed tube may be placed or
withdrawn from within a suitable cavity defined by the rear cover and the
retainer plate.
A front extension 106 is disposed to the front of slide body 50 shown to
the left in FIGS. 3 and 5. As can be seen the front extension has the same
cross-section as the rivet slide body. It is held in place by socket-head
cap screws 108 which pass through suitable apertures in the front
extension and are received in threaded apertures in the body 50, this
being best illustrated in FIG. 3. An alignment pin or dowel 110 also is
received within suitable apertures. The front extension is provided with a
vertically extending channel 112 which receives a discharge coupling 114
which is generally square in cross-section, the coupling being provided
with an aperture 114a which serves as a discharge opening. Opposed ramps
114r (FIG. 4) lead to the opening 114a. The coupling is further provided
with a barbed extension 114e (FIGS. 3 and 6) which receives one end of a
dedicated feed tube. The coupling is also provided with a key 114k to
ensure that it is properly located.
Further, indicated generally at 116, retaining means are provided for
retaining the discharge coupling 114 and dedicated feed tube 16. The
further retaining means 116 is of a similar construction to the retaining
means 98, and thus include a retainer plate 118 which is pivotly secured
to the body 106 by a shoulder screw 120 (FIG. 6). The retainer plate 118
is pivotal between open and closed positions and may be retained in its
closed position by a thumbscrew 122. The retainer plate is provided with a
C-shaped cutout for engaging the extension 114e of the coupling 114. In
addition, a further notch 126 (FIG. 4) is provided in the retainer plate
118, the notch engaging the thumbscrew 122.
The body 50 is provided with a notch or step in its upper surface forwardly
of the cover 90 and a further cover 128 extends over this notched portion,
the further cover 128 being held in place by thumbscrews 130.
In order to facilitate the operation of the adjustable orientator 12 a
control assembly is provided, which assembly includes a first detector 132
(FIG. 1) in the form of ring proximity sensor, which transmits a signal to
controller 134 when a fastener has passed through the discharge end of the
non-dedicated feed tube. The controller 134 is additionally interconnected
with an optical scanner assembly including an optical pickup 136 (FIGS. 5
and 6) and an optical pickup processor 138, the pickup and processor 136,
138 being interconnected by a fiber optic cable 140.
In addition to the control assembly 132 through 140, additional air-driven
devices and controls are provided. In order to ensure that the fasteners
will progress along the shoulder portions 52s, 56s, an air-driven vibrator
142 is provided which vibrator is suitably mounted on the body 50 by means
of a shoulder screw 144 (FIG. 4). The vibrator is in turn connected with a
constant air supply through a constant air supply fitting 146, nipple 148,
tee 150, and needle valve 152. The constant air supply is additionally
connected to a suitable rivet assist blow tube 154 (FIG. 3) and orificed
fitting 156 by additional fitting 158, flow control or needle value 160,
tee 162, fluid lines 164, 166, and a still further fitting 168 which
connects air line 164 with air line or blow tube 154.
In addition to the constant air supply which is used to ensure that the
fasteners will move along the shoulder portions 52s and 56s towards the
discharge opening 112, blow-back air is also provided, this air being
introduced through a valved air supply fitting 170 (FIG. 4), a needle
valve 172, and thence by suitable air passages to provide blow-back air as
indicated by the arrow 174.
The adjustable orientator is operated by initially adjusting the flank
spacing of the jaws 152, 156 to a distance just slightly in excess of the
tail diameter of the fastener to be oriented. Shop air supply is then
initiated through fitting 146 and valved shop air, under the control of
controller 134 is then connected to fitting 170. Fasteners will now be
introduced at selected time intervals through the discharge end of the
non-dedicated feed tube 118. The passage of a fastener through the
discharge end will be sensed by the ring proximity senser 132 and a
suitable signal will be transmitted to the controller 134 to initiate the
operation of a timer. In the meantime, a stop 176 (FIG. 5), which is a
piston rod, will be extended to block the movement of a passage beyond the
optical sensing area, the stop being interconnected to a piston within an
air cylinder assembly 178 which is in turn suitably interconnected with
shop air by a valved connector under the control of controller 134. The
cylinder assembly 178 will normally be biased to a retracted position by
an internal spring (not shown) and the introduction of air to the cylinder
assembly 178 will cause the stop to be extended. The fastener which passes
through the discharge end of the non-dedicated feed tube will be propelled
against a polyurethane pad 180 carried by a damper cover 182 which is
secured to the top front of cover 90 by means of cap screws 184. The
polyurethane pad 180 will dampen the impact of the fastener as it is
projected against the damper cover and the fastener will tumble within the
cut-out portion 90r until it falls upon the shoulder portions 52s, 56s of
the jaws 52, 56. In normal operation the tail of the fastener will drop
between the flanks 52f, 50f, and 56f of the jaws, the head of the fastener
being supported by the shoulder portions 52s and 56s. The fastener will be
propelled from the right-hand side to the left-hand side as viewed in
FIGS. 3 through 5, both due to the operation of the vibrator 142, as the
right-hand side is held at a higher location than the left-hand side as
can be seen from FIG. 1, and also by the action of the air introduced into
the body through air line 154, as well as gravity and momentum of
fastener. When the presence of a fastener is detected by the optical
pickup 136 a signal will be sent by the controller 134 to a valve (not
shown) which will cause the stop 176 to retract and then permit the
further movement of the fastener to the discharge opening 112, the
fastener then falling through the discharge opening into the inlet end of
the dedicated feed tube assembly 16, the dedicated feed tube assembly
being so selected that its inner diameter is suitable for those fasteners
which are being assembled to the workpieces. In the event that a fastener
should become caught or otherwise fail to become suitably oriented, its
presence will not be sensed by the optical pickup 136. If the optical
pickup does not sense a fastener within 2 seconds or any other suitable
timed period selected by the operator, the timer within controller 134
will initiate the operation of blow-back air wherein spurts of air,
indicated by arrow 174, are caused by progressively valving the source of
air to fitting 170. These spurts of air will cause a retumbling action of
the fastener to facilitate its orientation. In the event that the senser
136 does not sense the presence of a fastener after a further suitable
series of "blow backs" an alarm will be initiated at the controller 134.
(Blow backs are spaced in 1 second intervals)
Dedicated Feed Tube
The dedicated feed tube assembly 16 includes an inlet portion (no number)
which is secured to the discharge coupling 114 and an intermediate tubular
portion 186 and a discharge end or coupler 188. The coupler 188 is
provided with an annular groove 190 which may be engaged by a detent in
the manner set forth below.
Adjustable Injector
The adjustable injector 14 is best shown in FIGS. 8 through 13 and includes
an injector body indicated generally at 192, the injector body being
provided with a box-like cavity. The injector body is formed from a bottom
plate 194, left and right side plates 196, 198, respectively, and a rear
end plate 200. The various plates are held together by suitable cap screws
202. The front side of the injector body is open. As can best be seen from
FIG. 9 the adjustable injector is provided with a top cover plate 204 also
held in place by suitable screws 206. The forward end of the top cover
plate 204 is provided with a circular aperture 208. A horizontal
transversely extending aperture is formed in the top cover plate 204 in
line with the circular aperture 208 and a ball detent assembly, indicated
generally at 210, is disposed therein, the ball 212 of the assembly 210
projecting slightly into the aperture 208. The purpose of the ball is to
engage the groove 190 of the coupling assembly 188 to retain the discharge
end of the dedicated feed tube assembly in its proper position in the
adjustable injector.
Mounted within the box-like cavity of the injector body is an injector
slide, indicated generally at 214 (in FIGS. 11-13), which slide is
moveable from a first retracted position, illustrated in the various
FIGS., to a second fastener injecting position. The injector slide
includes a base portion 216, left-hand and right-hand side portions 218,
220, respectively, a back portion 222, and a top portion or stop plate
224. The various portions 216 through 224 are secured to each other in a
manner not material to the present invention. An injector knife 226 (FIG.
13) and a pair of left-hand and right-hand spaced apart adjustable jaws
228, 230, respectively, are mounted above the base portion 216. To this
end, the injector knife 226, which is of a relatively thin plate-like
construction, is guided between two pair of lower guides and two pair of
upper guides. The lower guides consist of left-hand and right-hand guides
232 which are secured by socket-head cap screws 234. The upper guides,
which are supported upon the stop plate 224, are of the same construction
and therefore bear the same reference numerals. The injector knife 226 is
provided with an elongated slot 226s (FIG. 11) through which an
intermediate portion 236 of a screw assembly 238 passes. The screw
assembly includes left-hand and right-hand threaded portions 240, 242, as
well as suitable spacers and bearing portions. A portion of the screw
assembly 238 extends through a suitable aperture 196a in the left-hand
side plate 196 of the injector body 192. Mounted on an exterior portion of
the screw assembly 238 is a gear 244 and handwheel 246 which carries
manually engagable knob 248. The screw assembly can be formed in any
manner but is preferably formed by securing various parts to a shaft 250
by means of roll pins 252. The left and right adjustable 228, 230 jaws are
provided with threaded apertures 254 (FIG. 12) through which the threaded
portions 240, 242 extend. In order to take up any backlash which may
exist, compression springs 256 bear against the jaws 228, 230 one end of
each of the compression springs being received in a suitable aperture in a
side plate 218, 220.
The forward ends of each of the jaws is provided with a suitable notched
portion 228n, 230n which may receive the tail of a headed fastener. The
forward end of each of the jaws is suitably adjusted by rotating the knob
248 so that the spacing between the forward ends of the jaws is just
slightly less than the diameter of the tail. The forward end of each of
the jaws is provided with a pressure pad 258 which is maintained in an
outwardly extending position by a spring action so that the pressure pad
may be moved back against spring pressure as a fastener is being ejected
by the injector knife 226. Each pad 258 is carried by a pin 259 (FIG. 10)
which is in turn provided with a groove which receives a flat-washer 259c.
The spring action for each pad 258 is accomplished by a pair of spring
detent assemblies 259d similar to that shown at 212.
The centerline of the notches 228n, 230n is closely concentric to the
centerline of the discharge end 188 of the dedicated feed tube 16. Thus,
as a headed fastener is being projected downwardly through the dedicated
feed tube it will be propelled into the location between the fingers with
the tail end of the headed fastener being received within the notches
228n, 230n. In order to ensure that the proper spacing is maintained an
indicia gear 260 (FIG. 8) is provided, which gear is in engagement with
the gear 244 associated with the handwheel 246 so that when the knob 248
is engaged and rotated the indicia gear will also be caused to be rotated.
The indicia gear will be rotated to such a position that one of the
indicia 260i on the gear 260 is lined up with an indicia mark 262 on the
surface of the left plate 196. When this happens the index pin 264 carried
by the knob 248 may be spring-biased into an aperture 260a of the gear
260. It can be seen from the above that the rotating knob 248 and index
pin 264 are of the same construction as the rotating knob 76 and index pin
78 of the adjusting mechanism shown in FIGS. 3 through 7. Thus, a
compression spring 266 is additionally provided which will normally bias
the end of the pin 264 into the aperture 260a.
As has previously indicated, the injector slide can be moved from a first
fastener receiving position to a second fastener injection position and
also the injector can be moved from a retracted position to an extended
position. To this end, as can be seen from FIGS. 1 and 13a, a cylinder
assembly indicated generally at 268 is provided, the cylinder assembly
including a piston (not shown) disposed within a cylinder 270. One end of
the cylinder is provided with a flange 272 which may be secured in any
desired manner to the back plate 200 of the injector body 192. To this
end, as can be seen from FIG. 13, the back plate is provided with a
suitable aperture 200a, the flange being concentric with the aperture. A
piston rod 274 extends through the flange 272 and the aperture 200a, the
end of the piston rod 274 remote from the cylinder 270 being secured to a
rod extension 276 by roll pin 278. The rod extension 276 is in turn
secured to a forked sleeve 280 by another roll pin 282. The bifurcated end
of the sleeve 280 is in turn rigidly secured to the rear end of the
injector knife 226. As can best be seen from FIG. 11 when all parts are in
their normal retracted position, with the rod extension 276 and bifurcated
sleeve 280 being disposed in their retracted position, shown to the right
in FIGS. 11 and 13 the rear end of the injector knife 226 will be bearing
against the front surface of the back wall 222. To this end a compression
spring 284 disposed about the rod extension 276 will normally force the
wall 222 into engagement with the injector knife 226, the ends of the
compression spring being received within suitable annular recesses in
walls 200 and 222.
With further reference to FIGS. 1 and 13a it can be seen that a piston rod
extension 286 is provided which extends beyond the rear flange 288 of the
cylinder assembly. Mounted on the rear end of the rod 286 is a stop 290
which is held in place by nut 292 which engages a threaded extension of
the rod extension 286. As can best be seen from FIG. 1 the stop 290 is
provided with two laterally spaced apart stop portions 290s. In order to
adjust the stroke of the piston and correspondingly the movement of the
injector an adjustable stop plate 294 is provided which has various stop
surfaces 294.1, 294.2, . . . 294.n may be engaged by the stop portions
290s. The adjustable stop plate is supported for transverse sliding
movement on a mounting plate 296 and may be secured in place by thumbscrew
298 provided with a handle 300.
The stroke of the injector slide is also varied by an adjustable stop
mechanism best shown in FIGS. 9 and 11 which consists essentially of a
stop block 302 received within a suitable aperture in the top cover plate
204, the stop block being provided with suitable indicia 302i, which may
also be lined up with corresponding indicia 204i on the cover plate 204. A
shoulder screw 304 is screwed into a suitable aperture in the stop block
302 and acts as a handle. The stop block can be withdrawn from the
aperture, rotated to its proper position and reinserted into the aperture.
A lower portion or stop surface 302.1, 302.2, or 302.3 of the stop block
is capable of being engaged by a step portion 224s of the stop plate 224
to limit the outward movement of the injector slide 214. The stop block
302 can be held in its adjusted position by turn screw 306.
The adjustable injector is operated by initially adjusting the adjustable
jaws 228, 230 so that the spacing between the pressure pads 258 is just
slightly less than the tail diameter of the fastener to be inserted. As it
is necessary to shift the parts forwardly to properly position the
fastener so that it is concentric with the centerline 308 of the fastener
grasping fingers 46 (FIG. 1) it is necessary to adjust the stop positions
for both the injector slide and the injector. This is done by suitably
positioning the adjustable stops 302 and 294. It is of course presumed
that the apparatus has been properly positioned with respect to the
fingers 46 by previously adjusting the spacing through shims 36 and
through the slide assembly 38. Once the parts have been suitably adjusted
it is only necessary to initiate the operation of the cylinder by
introducing air behind the piston in cylinder 270 in any suitable manner
to cause the piston rod 274 to move forwardly (to the left as viewed in
FIGS. 12 and 13). When this occurs, initially the injector slide assembly
and injector will move together as the compression spring 284 forces the
injector slide assembly 214 to move with the injector knife 226 as the
compression spring will cause the front wall of the back plate 222 to be
maintained in engagement with the rear edge of the injector knife 226
until the step surface 224s engages the stop 302. As this is happening the
injector slide assembly will be supported by gibs 310 which are received
within suitable slots between the left-hand and right-hand walls. Thus,
one of the gibs 310 is positioned between the left side plate 196 and the
left-hand slide portion 218. Another gib 310 is positioned between the
right side plate 198 and the right-slide portion 220.
Continued movement of the injector knife 226 after stop 302 has been
encountered by step 224s of the top plate of the injector slide assembly
214 will cause the injector knife to move relative to the jaws 228, 230
causing the curved leading end 226c to engage the stem of the fastener and
force it between the pressure pads 258 until it clears the compression
pads and is then free to enter into the fastener grasping fingers 46. When
the fastener has been injected into the fingers 46, the piston rod will be
caused to be withdrawn so that another cycle of operation can be
performed. It should be appreciated that the control means 134 may also be
utilized in the initiation of the operation of the cylinder assembly 268.
While the air lines to the cylinder assembly 268 have not been shown, it
should be appreciated that any suitable air lines and valving may be
employed.
While operation has been described where a headed fastener is being
inserted into the grasping fingers 46, it is also possible to use the
injector assembly 14 for the purpose of inserting slug rivets into slug
rivet receiving fingers. When the injector is used for this purpose it is
used without the orientator 12 and a dedicated feed tube will extend
directly from the slug selection hopper to the injector. When a slug rivet
has been received between the jaws 228 and 230 it will be caused to be
ejected by the injector knife 226. The slug will be moved from the right
to the left as viewed in FIG. 13 and will be firmly held in position
during ejection by the pressure pads 258. In addition, when the slug is
originally received within the notched areas 228n and 230n, it will be
supported by a slug rest 312. The slug rest 312 is of a C-shaped
configuration as can be seen from FIG. 10 and is held in a groove on the
forward end of the base portion 216 by a detent assembly 314. As shown in
FIG. 11 the slug rest is in its uppermost position where it supports slugs
having the shortest length. However, if longer slugs are to be inserted
the slug rest may be inverted to another position where the slugs are
supported at a lower level. However, when using headed fasteners having a
long tail length it may be desirable to entirely remove the slug rest 312
and to this end it may be stored in a slug rest storage clip 316 which is
secured to a side of the right side plate 198 by screws 318 as can be seen
in FIG. 9.
While a preferred structure in which the principles of the present
invention have been incorporated is shown and described above, it is to be
understood that the invention is not to be limited to the particular
details, shown and described above, but that, in fact, widely differing
means may be employed in the practice of the broader aspects of this
invention.
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